Определение и Значение "all singing, all dancing"

What is the origin of the idiom "all singing, all dancing" and when to use it?

The idiom "all singing, all dancing" originated in the entertainment industry, particularly in reference to elaborate stage productions and musicals. It is used to describe something or someone that is highly elaborate, flashy, or extravagant, often involving a combination of singing, dancing, and other theatrical elements. The phrase emphasizes the full range of entertainment and spectacle associated with a performance, conveying a sense of excitement and grandeur.